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Lower Unit Noise: Bearings, Gears, or Something Else? If your outboard is making unusual noise, especially from the lower unit, it is not something to ignore. What starts as a small sound can quickly turn into a major repair if left unchecked. The key is understanding what the noise might be telling you. Grinding or Growling Noise A grinding or deep growling sound is one of the most serious warning signs. This is often related to worn or failing bearings or internal gear damage. Common causes: …

The lower unit, also called the gearcase, is the bottom section of an outboard that sits partially underwater and connects the engine's power to the propeller. When the engine runs, power travels down the driveshaft into the lower unit. Inside the gearcase, gears redirect that rotation to the propshaft, which turns the propeller. In simple terms: Engine → Driveshaft → Gearcase → Propshaft → Propeller But transferring power isn't the lower unit's only job. What's Inside an Ou …